Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

A contemporary art installation housed within a Gothic cathedral.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

The world's largest wooden structure.

Of course Salvador Dalí lived in a castle...

A temple to modernity, tucked away amid Barcelona's more well known museums.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A stately palace has been converted into the world's largest cannabis museum.

The final resting place of the great navigator, or maybe his brother.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Commonly acknowledged as the only public monument to the Devil himself.